作业帮1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
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1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）
简便运算
1.3/13-2/5+10/13-3/5 2.2/7除以[3/7x(2/3+7/9)]（/是分数线）（简便运算）简便运算
1.3/13-2/5+10/13-3/5
=(3+10)/13-(2+3)/5
=1-1
=0
2.2/7除以[3/7x(2/3+7/9)]
=(2/7)除以[3/7x(6/9+7/9)]
=(2/7)除以[3/7x(13/9)]
=(2/7)除以[13/21]
=(2x21)/(7x13)
=6/13